chore: add go.sum to version control and copy in Dockerfile
Add empty go.sum file (no external dependencies yet) and update the Dockerfile build stage to COPY go.sum alongside go.mod for reproducible module downloads. This ensures the Docker build does not fail when Go requires go.sum to be present. Closes leeworks-agents/gitea-mobile#203 Closes leeworks-agents/gitea-mobile#180 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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